Table 2:
Sample Statistics for Main Outcome Variables by Treatment Group and Time Point.
| Overall N = 149 |
ABC-I N = 74 |
CBT-I N = 75 |
||
|---|---|---|---|---|
| Mean (SD) | Mean (SD) | Mean (SD) | p-valuea | |
| Baseline | ||||
| Insomnia Severity Index (ISI), total score | 14.4 (5.0) | 14.2 (4.8) | 14.6 (5.1) | 0.638 |
| Pittsburgh Sleep Quality Index (PSQI), total score | 10.7 (3.7) | 10.3 (3.4) | 11.1 (4.0) | 0.209 |
| Sleep efficiency (SE) by sleep diary, % | 77.8 (13.2) | 77.9 (12.4) | 77.7 (13.9) | 0.932 |
| Sleep efficiency (SE), by actigraphy, % | 80.8 (8.2) | 80.3 (9.0) | 81.3 (7.4) | 0.456 |
| Immediate Post-Treatment | ||||
| Insomnia Severity Index (ISI), total score | 5.4 (4.9) | 5.5 (4.8) | 5.4 (5.0) | |
| Pittsburgh Sleep Quality Index (PSQI),total score | 5.1 (3.4) | 5.2 (3.3) | 5.0 (3.5) | |
| Sleep efficiency (SE) by sleep diary, % | 91.2 (7.2) | 91.3 (5.8) | 91.2 (8.3) | |
| Sleep efficiency (SE), by actigraphy, % | 82.9 (6.7) | 82.8 (6.9) | 83.0 (6.6) | |
| 3-Month Post-Treatment Follow-up | ||||
| Insomnia Severity Index (ISI), total score | 6.5 (5.7) | 6.0 (4.9) | 6.9 (6.4) | |
| Pittsburgh Sleep Quality Index (PSQI),total score | 5.9 (4.2) | 5.5 (3.7) | 6.4 (4.6) | |
| Sleep efficiency (SE) by sleep diary, % | 89.8 (7.5) | 90.1 (7.3) | 89.6 (7.7) | |
| Sleep efficiency (SE), by actigraphy, % | 81.7 (7.0) | 81.6 (7.7) | 81.7 (6.5) | |
a
p-value comparing groups at baseline using an independent samples t-test.